It works fine for DIY projects. I've found that leak detection with this unit depends on good technique; no cross drafts, good probe handling, etc. The detector can go off several inches from the actual leak so through probing is a must to pinpoint the leaks.

Once you get used to how it works, it's pretty easy to use effectively.

Ditto on the Yokogawa. Heavy, but it never gives a false positive. I always had problems with the corona detectors as far as false positives and tracking down really tough to find leaks. When the Yokogawa beeps, you know there is a leak. Too bad they are so expensive now. Got mine for about $250 back in the mind 90s.